Improvement in scaffolds



.5. F. HARLEY.`

Scaffolds.

Patented Jan. 14, 1873.

STATES- JQHN F. DARLEY, OF NEBRASKA CITY, NEBRASKA.

IMPROVEMENT IN SCAFFOLDS.

Specication forming part of Letters Patent No. 134,737, dated January14, 1873.

To all whom it may concern:

Be it known that I, JOHN F. DARLEY, of Nebraska City, in the county ofOtoe and State of Nebraska, have invented a new and Improved Jack-.Trestle 5 and I do hereby declare that the following is a full,clear, and eXact description thereof, reference being had to theaccompanying drawing making part of this specification, in which- Figurelisa perspective view of the jack arranged for use outside of a window;Fig. 2 is a perspective view, showing the jack arranged for use as aplatform-support; and Fig. 3 is a side view of one of the steppedSimilar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to certain novel improvements on the buildersjack for which Letters Patent were granted to me bearing date on the28th day of May, 1872. The improvements relate to a novel mode ofattaching legs to the platformbeam, and also to a sill-support for theplatform-beam, as will be hereinafter explained.

The following description of my invention will enable others skilled inthe art to understand it.

In the accompanying drawing, A represents a platform-beam, which isslotted longitudinally, as shown at a, and on one end of which aplatform, B, is rigidly secured. C represents a cross-brace, ofsufficient length to extend across the widest window-frame, which braceis passed horizontally through the slot ct and fastened to the beam A bymeans of a vertical pin, b. The holes b receive the pin b', when thebrace C is adjusted opposite them. D D are stepped blocks, which areintended for insertion between the brace C and a window-frame, and whichare covered on one side with India rubber d, thus forming cushions whichprevent the brace from abrading a window-frame. Between the platform Band the slot c are devices for fastening the legs G of Fig. l, or legsvSof Fig. 2, to the beam A. These devices consist of lugs g g and eyes f,applied on each side of the beam A, so as to receive between them theupper ends of said legs. By means of pins c the legs are secured to theeyes f. The legs Gr G, Fig. l, are short, and have applied to them ahorizontal piece, J, which is intended to rest upon a window-sill, andafford a broad base support for the platform and its beam. The legs S S,being pivoted to the eyes f by the pins e, can be adjusted laterally soas to increase or diminish the distance between their lower ends. Thenotched brace or the bar t is pivoted to one of the upper sections S,and connected to the other upper section by means of a pin, c'. This bart will hold the legs at any desired distance apart. Each leg consists oftwo sections, S S', which are connected together by loops a n and pinsJm, so that by removing the pins the sections can be extended orcontracted'in length. The pins on are square, and the holes for them aremade by grooving the sides of .the sections which are together, so thatone-half the pin is received into one groove and the other half into theopposite groove, thus preventing endwise play of the leg-sections.

When the yoke is arranged as shown by Fig. l, it is used in a window,the piece J resting on the window-sill, and the piece C extending acrossthe window-frame.

When the jack is arranged as shown by Fig. 2, it is designed for use asa platformsupport for brick-layers, plasterers, and others, and when soarranged the beam A and platform B can be adjusted at different heights.

By leaving off the platform B of two beams A, and connecting these beamstogether by means of clamp-screws applied through the slots a, using thelegs shown in Fig. 2, inclining from each other, a trestle will beformed on which planks may be laid and vsupported for plasterers use.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is 4 l. The removable legs G and cross-bar J, incombination with the platform-beam A and platform B, substantially asdescribed.`

2. The longitudinally and laterally extensiblesectional legs S S',pivoted to eyes f and brace t, in combination with the lugs g andplatform-beam A, substantially as described.

3. The cushions and stepped blocks lD, for the purpose described.

JOHNF. DARLEY.

Witnesses ELLIS L. BIERBOUER, V. BIERBOUER.

